Spontaneous Abortion (Missed)MANAGEMENT

OBSTETRIC PRESENTATIONS · 12 SECTIONS

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518 items

☷ Legend

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Cardiovascular Presentations71▾

Respiratory Presentations52▾

Neurological Presentations83▾

Gastrointestinal Presentations74▾

Genitourinary and Reproductive Presentations48▾

Infectious Disease Presentations148▾

Trauma Presentations89▾

Toxicologic Presentations80▾

Psychiatric Presentations26▾

Musculoskeletal and Rheumatologic Presentations96▾

Dermatology Presentations23▾

Environmental and Exposure Presentations27▾

Hematologic and Oncologic Presentations36▾

Pediatric-Specific Presentations19▾

Endocrine and Metabolic Presentations45▾

ENT and Maxillofacial Presentations27▾

Ophthalmologic Presentations19▾

Obstetric Presentations23▾

Chorioamnionitis Eclampsia Ectopic Pregnancy (Ruptured)Ectopic Pregnancy (Unruptured)HELLP Syndrome Hyperemesis gravidarum Peripartum cardiomyopathy Placenta previa Placental abruption Postpartum Endometritis Postpartum hemorrhage Postpartum infection Preeclampsia Preeclampsia-eclampsia Preterm labor Sepsis in pregnancy Septic abortion Shoulder dystocia Spontaneous Abortion (Incomplete)Spontaneous Abortion (Missed)Spontaneous Abortion (Threatened)Threatened-inevitable-incomplete abortion Umbilical cord prolapse

Systemic and Miscellaneous Presentations17▾

01Approach to the Critical Patient/attcp33

Hemodynamic instability

›Hemorrhagic shock triggers

›Soaking more than 1 pad per hour for 2 or more consecutive hours

›Heart rate greater than 100 bpm as early marker

›SBP less than 90 mmHg as late marker

›Syncope or presyncope with active bleeding

›Orthostatic vital signs

›Pallor and diaphoresis

›If hemodynamically unstable, large-bore IV access and crystalloid resuscitation

›Two peripheral IVs, 18 gauge or larger

›1 litre normal saline bolus, reassess after each litre

›Type and crossmatch for active hemorrhage

›Transfusion threshold hemoglobin less than 70 g/l or symptomatic anemia

Septic abortion triggers

›Sepsis recognition

›Fever greater than 38 C with uterine tenderness

›Purulent or foul-smelling vaginal discharge

›Leukocytosis with left shift

›Refractory hypotension with exaggerated leukocytosis

›Concern for clostridial infection (Clostridium perfringens, Paeniclostridium sordellii)

›Toxic shock presentation possible

›If septic abortion suspected, broad-spectrum IV antibiotics within 1 hour

›Urgent OB/GYN consult for emergent surgical evacuation

›Blood cultures before antibiotics

Key decision points

›Diagnosis confirmation before treatment

›Strict ultrasound criteria required to avoid terminating viable pregnancy

›CRL 7 mm or greater with absent cardiac activity: definitive

02History/hx60

Obstetric context

›Pregnancy dating

›Last menstrual period and gestational age by LMP

›Dating ultrasound results if available

›IVF or assisted reproduction: embryo transfer date

›Prior ultrasound documentation

›Previously confirmed fetal cardiac activity

›Prior crown-rump length measurement

›Quantitative beta-hCG trend if serial levels obtained

›Plateau or decline supports nonviability

Symptom assessment

›Presenting symptoms

›Vaginal bleeding

›Onset, volume, and color

›Passage of tissue or clots

›Pelvic or abdominal cramping

›Location and severity

›Worsening trend suggesting complication

›Loss of pregnancy symptoms

›Resolution of nausea

›Decreased breast tenderness

Alarm features

›Critical red flags

›Heavy hemorrhage with hemodynamic instability

›Tachycardia, hypotension, syncope

›Soaking more than 1 pad per hour

›Fever, chills, or purulent discharge

›Concern for septic abortion

03Physical Exam/exam39

Vital signs

›Hemodynamic stability assessment

›Heart rate

›Tachycardia greater than 100 bpm as hemorrhage or sepsis marker

›Orthostatic change if borderline

›Blood pressure

›SBP less than 90 mmHg: immediate intervention threshold

›MAP less than 65 mmHg: vasopressor consideration

›Temperature

›Fever greater than 38 C: septic abortion concern

›Hypothermia: severe sepsis marker

›Oxygen saturation

›Baseline room air value

Abdominal and pelvic exam

›Systematic abdominal assessment

›Abdominal tenderness

›Suprapubic tenderness consistent with uterine cramping

›Peritoneal signs suggesting ectopic rupture or perforation

›Uterine size estimation

›Size smaller than expected for dates: supports fetal demise

›Fundal height assessment

Speculum and bimanual exam

›Pelvic examination findings

›Cervical os status

›Closed os: consistent with missed abortion

›Open os: suggests inevitable or incomplete abortion

›Active bleeding quantification

›Volume estimation from pooled blood

04Differential Diagnosis/ddx39

Life-threatening diagnoses

›Must-not-miss diagnoses

›Ectopic pregnancy

›ICD-10: O00.9

›Cannot-miss if prior IUP not confirmed

›Differentiating: adnexal mass, free pelvic fluid, no IUP on TVUS

›Septic abortion

›ICD-10: O03.87

›Fever, purulent discharge, uterine tenderness, hemodynamic instability

›Clostridial sepsis: toxic shock, rapid deterioration

›Hemorrhagic shock from uterine bleeding

›ICD-10: O03.1

›Tachycardia, hypotension, pallor

Early pregnancy loss spectrum

›Abortion type differentiation

›Threatened abortion

›ICD-10: O20.0

›Viable IUP, fetal cardiac activity present, vaginal bleeding

›Inevitable abortion

›ICD-10: O03.4

›Open cervical os, products not yet passed

›Incomplete abortion

›ICD-10: O03.4

›Partial tissue passage, open os, retained products

›Complete abortion

›ICD-10: O03.9

›Full expulsion confirmed, empty uterus, closed os

›Anembryonic pregnancy (blighted ovum)

05Laboratory Tests/lt38

Essential labs

›Quantitative beta-hCG

›Establishes baseline for nonviable pregnancy assessment

›Discriminatory zone 1,500 to 3,000 mIU/mL: IUP should be visible on TVUS above this level

›Serial levels if diagnosis uncertain: should plateau or decline in nonviable pregnancy

›Failure to decline after evacuation: retained products or gestational trophoblastic disease

›Single value interpretation limited

›Serial measurement 48 hours apart more informative

Hematologic labs

›Complete blood count

›Hemoglobin and hematocrit

›Baseline for hemorrhage assessment

›Transfusion consideration if hemoglobin less than 70 g/l or symptomatic

›White blood cell count

›Leukocytosis with left shift: infection concern

›Normal WBC does not exclude early sepsis

Blood type and Rh status

›Rh status determination

›Blood type and antibody screen mandatory in all pregnant patients

›Rh-negative, unsensitized patients: Rh immunoglobulin required

›50 mcg dose adequate in first trimester (300 mcg if lower dose unavailable)

›Administer within 72 hours of diagnosed pregnancy loss

›Rh alloimmunization prevention

›SMFM 2024 guideline: RhIg recommended for spontaneous or induced abortion less than 12 weeks

Coagulation studies

›DIC screen

›Indications: prolonged retained fetal demise, hemodynamic compromise, heavy bleeding

›PT/INR

06Diagnostic Tests/dt49

Scoring Systems

›No validated clinical scoring system for missed abortion

›Diagnosis is ultrasound-based per ACOG and SRU consensus

›Clinical judgment guides management pathway selection

›Patient preference central to shared decision-making

›Recurrent pregnancy loss workup thresholds

›Recommended after 2 or more consecutive losses, not after single event

›ACOG Practice Bulletin No. 200, 2018

MRI

›MRI role in missed abortion

›Not first-line for diagnosis of missed abortion

›Indicated only when ultrasound inconclusive and ectopic or trophoblastic disease suspected

›No radiation exposure advantage over ultrasound in first trimester

›MRI indications in early pregnancy complications

›Suspected gestational trophoblastic neoplasm with organ invasion

›Cervical ectopic or interstitial ectopic evaluation when ultrasound indeterminate

›Abdominal pregnancy localization

›CT role in missed abortion

›Not routinely indicated for uncomplicated missed abortion

›Reserved for surgical emergencies: suspected uterine perforation, septic source evaluation

›Radiation exposure consideration: 10 to 20 mGy fetal dose with abdominal CT

›CT abdomen and pelvis indications

›Peritoneal signs with hemodynamic instability

›Post-procedural complication assessment (perforation, abscess)

›Free intraperitoneal air after surgical evacuation

Ultrasound

›Transvaginal ultrasound (TVUS)

07Disposition/dispo37

Discharge criteria

›Safe discharge conditions

›Hemodynamic stability confirmed

›Heart rate less than 100 bpm

›SBP greater than 90 mmHg without intervention

›No signs of infection

›Afebrile, non-tender uterus, no purulent discharge

›Reliable follow-up within 7 to 14 days

›Patient understands management options (expectant, medical, surgical)

›Return precautions reviewed and understood

Admission criteria

›Indications for hospital admission

›Hemodynamic instability or hemorrhage requiring transfusion

›Active heavy bleeding with hemoglobin falling

›Transfusion requirement

›Septic abortion

›Fever, uterine tenderness, systemic toxicity

›Emergent surgical evacuation required

›Suspected or confirmed DIC

›Abnormal coagulation parameters, oozing from IV sites

›Diagnostic uncertainty with high ectopic risk

›Cannot safely exclude ectopic as outpatient

Observation considerations

›Intermediate disposition

›Moderate bleeding requiring monitoring

›Repeat hemoglobin in 4 to 6 hours

›Serial vital signs

›Initiating medical management in ED

08Treatment/t68

Expectant management

›Expectant approach

›Appropriate for first trimester, hemodynamically stable patients

›Success rate approximately 80% over up to 8 weeks

›Less effective for missed abortion than incomplete abortion

›Counseling requirements

›Expect moderate to heavy bleeding and cramping

›May take several weeks for complete expulsion

›Surgical intervention may ultimately be required

›Follow-up plan

›Repeat TVUS in 7 to 14 days to assess expulsion

›Return precautions clearly communicated

Medical management

›Mifepristone plus misoprostol (preferred combination)

›Mifepristone 200 mg orally

›Wait 24 hours before misoprostol administration

›ACOG Practice Bulletin No. 200: preferred first-line medical regimen

›Misoprostol 800 mcg vaginally 24 hours after mifepristone

›Repeat dose if no response, no earlier than 3 hours after first dose

›Second dose typically given within 7 days if needed

›Complete expulsion rate

›83% with mifepristone plus misoprostol at 7 days (MifeMiso RCT, Lancet 2020)

›76% with misoprostol alone at 7 days

›RR 1.25 for complete expulsion with combination versus misoprostol alone

›Misoprostol monotherapy (if mifepristone unavailable)

›Misoprostol 800 mcg vaginally or sublingually

›Sublingual route: faster onset, more systemic side effects

Pain management

›Analgesia protocol

›NSAIDs: ibuprofen 400 to 800 mg orally every 6 to 8 hours

›Initiate before misoprostol administration

›Continue around the clock for first 24 to 48 hours

›Acetaminophen 500 to 1,000 mg orally every 6 hours as adjunct

›Safe in first trimester

›Opioid analgesia if severe pain

›Oxycodone 5 mg orally every 4 to 6 hours as needed

›Short course, reassess at 24 hours

Rh immunoglobulin

›RhIg administration

›Indication: Rh-negative, unsensitized patient with pregnancy loss

›SMFM Statement 2024: RhIg recommended for spontaneous or induced abortion less than 12 weeks

›Administer within 72 hours of diagnosis or procedure

›Dosing

›50 mcg (250 IU) IM: adequate dose in first trimester

›300 mcg IM: use if lower dose unavailable

›Rh sensitization prevention

›Without RhIg, risk of alloimmunization in subsequent pregnancies

Surgical management

›Suction aspiration

›Most effective management method overall

›SUCRA 92.7% in Cochrane network meta-analysis 2021

›Manual vacuum aspiration (MVA) or electric vacuum aspiration (EVA)

›Urgent surgical indications

›Hemorrhage or hemodynamic instability

›Septic abortion requiring uterine source control

›Failed medical or expectant management

›DIC or coagulopathy

›Preoperative antibiotic prophylaxis

›Doxycycline 200 mg orally before procedure

›ACOG recommendation: reduces post-procedural endometritis

›Cervical preparation

›Misoprostol 400 mcg vaginally 1 to 3 hours before procedure

›Facilitates dilation, reduces complication risk

Antibiotic therapy for septic abortion

›Empiric antibiotic regimen

›Broad-spectrum coverage for polymicrobial infection

›Piperacillin-tazobactam 3.375 g IV every 6 hours (or 4.5 g IV every 8 hours)

›Alternative: ampicillin-sulbactam 3 g IV every 6 hours

›Anaerobic coverage essential

›Metronidazole 500 mg IV every 8 hours if beta-lactam insufficient anaerobic coverage

›Clindamycin 900 mg IV every 8 hours as alternative

›Duration

›Continue IV until afebrile 48 hours after surgical evacuation

›Transition to oral antibiotics to complete 7 to 14 day course

09Special Populations/sp38

Pregnancy

›Heterotopic pregnancy consideration

›Occurs in approximately 1 in 7,000 spontaneous conceptions; higher risk with IVF

›Simultaneous IUP and ectopic pregnancy

›Failed missed abortion treated as IUP may mask co-existing ectopic

›IVF patients: higher index of suspicion required

›Medical management precautions in heterotopic pregnancy

›Mifepristone and misoprostol are contraindicated

›Surgical management required to preserve viable IUP

›Gestational dating accuracy

›Accurate dating critical to avoid premature diagnosis

›IVF dating by embryo transfer date is most accurate

›LMP-based dating unreliable in irregular cycles

›Ultrasound dating in first trimester: accuracy within 5 to 7 days

Geriatric

›Perimenopause and advanced maternal age

›Women aged 40 to 44 years: miscarriage risk 40%

›Women aged 45 years or older: risk up to 65%

›Chromosomal aneuploidy accounts for majority of losses in older patients

›Medical management considerations

›Mifepristone and misoprostol safe in older patients without contraindications

›Comorbidity review before surgical management under anesthesia

›Cardiovascular risk assessment for procedure under sedation

›Emotional impact

›Higher rate of pregnancy through fertility treatment: grief and loss counseling essential

›Screen for depression and anxiety at follow-up

Pediatrics

›Adolescent patients

10Background/b48

Epidemiology

›Incidence and prevalence

›Approximately 15% of all clinically recognized pregnancies end in miscarriage

›10 to 20% of pregnancies overall end in spontaneous abortion

›Estimated 23 million miscarriages per year worldwide (Lancet 2021)

›Missed abortion specifically

›Represents a subset of first-trimester pregnancy loss

›Diagnosis made by ultrasound in asymptomatic or minimally symptomatic patient

›Risk by maternal age

›12% at age 20 to 29 years

›20% at age 35 to 39 years

›40% at age 40 years

›65% at age 45 years or older (ACOG, Lancet 2021)

›Recurrence risk

›Increases approximately 10% per additional loss

›42% risk after 3 or more consecutive losses (Lancet 2021)

Pathophysiology

›Etiology of pregnancy loss

›Chromosomal abnormalities

›Approximately 50% of all early pregnancy losses attributable to fetal aneuploidy

›Trisomies account for majority (trisomy 16 most common)

›Polyploidy and monosomy X also common

›Maternal factors

›Antiphospholipid syndrome: thrombosis of placental vasculature

›Thyroid disease: hypothyroidism and hyperthyroidism both increase risk

›Poorly controlled diabetes: hyperglycemia affects embryogenesis

›Uterine anomalies: septate uterus most strongly associated with recurrent loss

›Retained products of conception mechanism

11Patient Discharge Instructions/pdi33

copy discharge instructions

›Discharge instructions for missed miscarriage

›What happened

›You were diagnosed with a missed miscarriage, also called a missed abortion

›This means the pregnancy stopped developing but has not yet passed from the uterus

›This is very common, affecting about 15 of every 100 pregnancies

›Your management plan

›Your doctor has discussed the three options: waiting for natural passage, medication, or a small procedure

›Follow the specific plan your doctor prescribed for you

›If given mifepristone: take it today, then take misoprostol as directed 24 hours later

›What to expect

›Bleeding and cramping are expected, often similar to a heavy period

›Bleeding may last 1 to 2 weeks

›Cramping is usually strongest in the first 24 hours after misoprostol

›Take your pain medicine before the cramping starts

›Return to the emergency department immediately if

›Soaking more than 1 pad per hour for 2 hours in a row

›Fever above 38 degrees Celsius (100.4 F)

›Severe abdominal pain that is getting worse

›Foul-smelling vaginal discharge

›Dizziness, lightheadedness, or fainting

›Signs of infection: chills, shaking, worsening pain

›Follow-up

›Attend your follow-up appointment in 7 to 14 days

›An ultrasound may be done at follow-up to confirm complete passage

›If you chose the medication approach, call your doctor if no bleeding begins within 24 hours of misoprostol

›Emotional support

›Miscarriage is a loss, and it is normal to feel sad, anxious, or grief

12References/r36

Guidelines and key sources

›ACOG Practice Bulletin No. 200: Early Pregnancy Loss

›Obstetrics and Gynecology, 2018

›Primary evidence-based guideline for management of missed abortion

›Covers expectant, medical, and surgical management options

›Doubilet PM, Benson CB, Bourne T, et al.

›Diagnostic Criteria for Nonviable Pregnancy Early in the First Trimester

›New England Journal of Medicine, 2013

›Established definitive ultrasound criteria: CRL 7 mm, MSD 25 mm thresholds

›Chu JJ, Devall AJ, Beeson LE, et al.

›Mifepristone and Misoprostol Versus Misoprostol Alone for Missed Miscarriage (MifeMiso)

›Lancet, 2020

›RCT demonstrating superiority of combination regimen (83% vs 76% complete expulsion at 7 days)

›Ghosh J, Papadopoulou A, Devall AJ, et al.

›Methods for Managing Miscarriage: A Network Meta-Analysis

›Cochrane Database of Systematic Reviews, 2021

›Suction aspiration ranked most effective overall (SUCRA 92.7%)

›Quenby S, Gallos ID, Dhillon-Smith RK, et al.

›Miscarriage Matters: The Epidemiological, Physical, Psychological, and Economic Costs of Early Pregnancy Loss

›Lancet, 2021

›Comprehensive epidemiology and risk factor data

›Prabhu M, Louis JM, Kuller JA

›SMFM Statement: RhD Immune Globulin After Spontaneous or Induced Abortion Less Than 12 Weeks

›American Journal of Obstetrics and Gynecology, 2024

›Updated guidance on RhIg dosing in first-trimester loss

›Expert Panel on GYN and OB Imaging, Laifer-Narin SL, et al.

›ACR Appropriateness Criteria: First Trimester Vaginal Bleeding, 2025 Update

›Journal of the American College of Radiology, 2025

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Reviewed by SymptomDx Medical Team · Last reviewed August 18, 2026

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